Data is increasing at a huge speed making it difficult to handle such large amount of data (exabytes).The main difficulty is handling such large amount of data because the volume is increasing rapidly comparing to the computing resources. Security and privacy issues are increasing by velocity, volume, and variety of big data, such as large-scale cloud infrastructures, area of data sources and formats, streaming nature of data acquisition and high volume inter-cloud migration. The utilization of large scale cloud infrastructures, with a use of software platforms, spread across large networks of computers, also increases the attack zone of the entire system. The current growth rate in the amount of data collected is staggering. A challenge for IT researchers and practitioners is that this growth rate is fast exceeding our ability to both design appropriate systems to handle the data effectively and analyze it to extract relevant meaning for decision making and major challenge is with respect to security of the data.